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/* This file is part of genrc
Copyryght (C) 2018 Sergey Poznyakoff
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
*/
#include "genrc.h"
static char *
progname_pattern(char const *prog)
{
grecs_txtacc_t acc;
char *ret;
static char const specials[] = "\\[]?.*+(){}|";
acc = grecs_txtacc_create();
grecs_txtacc_grow_char(acc, '^');
if (prog[0] != '/')
grecs_txtacc_grow_string(acc, "(/(.*/)?)?");
for (; *prog; prog++) {
if (strchr(specials, *prog))
grecs_txtacc_grow_char(acc, '\\');
grecs_txtacc_grow_char(acc, *prog);
}
grecs_txtacc_grow_char(acc, '$');
grecs_txtacc_grow_char(acc, 0);
ret = grecs_txtacc_finish(acc, 1);
grecs_txtacc_free(acc);
return ret;
}
void
match_regex_init(PROCSCANBUF buf, char const *pattern)
{
regex_t *rx = xmalloc(sizeof(*rx));
int rc;
char *tmp = NULL;
int cflags = REG_EXTENDED|REG_NOSUB;
if (buf->flags & PROCF_ICASE)
cflags |= REG_ICASE;
if (!pattern) {
pattern = tmp = progname_pattern(genrc_program);
}
rc = regcomp(rx, pattern, cflags);
free(tmp);
if (rc) {
char errbuf[512];
regerror(rc, rx, errbuf, sizeof(errbuf));
usage_error("invalid regular expression: %s", errbuf);
}
buf->pattern = rx;
}
void
match_regex_free(PROCSCANBUF buf)
{
regfree((regex_t*)buf->pattern);
free(buf->pattern);
}
int
match_regex(PROCSCANBUF buf, char const *arg)
{
return regexec((regex_t*)buf->pattern, arg, 0, NULL, 0);
}
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